Vegetation cutter with a dock for receiving obstacles

ABSTRACT

A vegetation cutter for cutting vegetation circumferent an obstacle. The vegetation cutter comprises a frame comprising a dock for receiving the obstacle; at least one cutter that is moveable in a cutting trajectory whereby vegetation circumferent a docked obstacle is cut; and a driver for moving the at least one cutter in the cutting trajectory. A method for cutting vegetation circumferent an obstacle.

RELATED APPLICATIONS

The present application is a continuation of and claims the benefit ofpriority under 35 U.S.C. §120 to International Application No.PCT/AU2014/050437, filed Dec. 19, 2014, which in turn claims the benefitunder 35 U.S.C. §119 to AU 2013905001, filed Dec. 20, 2013.

TECHNICAL FIELD

The present invention relates to a vegetation cutter for cuttingvegetation and, in particular, to a vegetation cutter for cuttingvegetation around an obstacle.

BACKGROUND ART

Roadsides in many countries must be lined with delineators (reflectors)at set intervals and traffic management signs (e.g. speed zonesignposts) to guide drivers. These delineators and signs must be visiblefrom a distance and hence cannot be covered by vegetation. Regularcutting of vegetation on roadside verges is therefore carried out tomaintain appropriate sightlines, as well as to manage bushfire risk andto ensure that roadside vegetation does not impede water runoff afterheavy storms.

Currently, vegetation on roadside verges is typically cut using aconventional slasher mounted on the back of a tractor. However, thisarrangement does not allow for the cutting of vegetation close todelineator posts etc., with attempts to do so often resulting in damageor destruction of the posts. As such, it is often necessary for peopleto subsequently walk the route with whipper snippers and/or chemicalvegetation spray management units to remove the remaining vegetation.

Mowers for cutting vegetation around posts and the like have beendisclosed in the prior art. For example U.S. Pat. No. 3,241,302discloses such a mower. However, such mowers are actuated by the postitself, as the mower moves past it, which can result in the post beingdamaged. It would be advantageous to provide alternative vegetationcutters for cutting vegetation around an obstacle.

It is to be understood that, if any prior art information is referred toherein, such reference does not constitute an admission that theinformation forms part of the common general knowledge in the art, inAustralia or any other country.

SUMMARY OF THE INVENTION

In a first aspect, the present invention provides a vegetation cutterfor cutting vegetation circumferent an obstacle. The vegetation cuttercomprises a frame comprising a dock for receiving the obstacle; at leastone cutter that is moveable in a cutting trajectory whereby vegetationcircumferent a docked obstacle is cut; and a driver for moving the atleast one cutter in the cutting trajectory.

In a second aspect, the present invention provides a method for cuttingvegetation circumferent an obstacle. The method comprises manoeuvring avegetation cutter of the first aspect of the present invention such thatthe obstacle is received in the dock; actuating the driver, whereby theat least one cutter moves in the cutting trajectory and vegetationcircumferent the docked obstacle is cut; and manoeuvring the vegetationcutter such that the obstacle is no longer in the dock.

The vegetation cutter of the present invention can, in one operation,cut vegetation circumferent an obstacle. As will be appreciated, this isa significant improvement over the techniques discussed above thatrequire a second (often relatively labour intensive) operation to removesuch vegetation.

The vegetation cutter of the present invention also does not rely onrelative movement with respect to the obstacle to cause cutting of thevegetation circumferent the docked obstacle. Instead, a driver isprovided which, once the obstacle is safely docked, drives the cutter(s)such that vegetation circumferent the docked obstacle is cut. As such,the obstacle is not subjected to the often damaging forces which occurduring use of prior art mowers that cut vegetation around posts and thelike.

Vegetation cutters in accordance with the present invention are alsolikely to be more precise than prior art mowers, which rely on anoperator accurately aligning post after post with an appropriate sectionof the mower, potentially whilst the mower is moving over rough ground.In the present invention, however, the obstacle is safely received inthe dock and the circumferential cutting then started, which may allowfor a closer positioning of cutter(s) to the obstacle. Furthermore, thelongevity of prior art mowers would be expected to suffer due to theconstant collisions between the mower and posts.

Vegetation cutters in accordance with the present invention aretherefore not only alternatives to prior art mowers that cut vegetationaround obstacles, but may also have a number of useful advantages oversuch mowers.

In some embodiments, the at least one cutter is moveable such that thecutting trajectory defines an arc around the docked obstacle. As wouldbe appreciated, many tree trunks and roadside obstacles (for example)are generally circular in shape, and an arc-shaped cutting trajectorywould enable a maximum amount of vegetation circumferent the obstacle tobe cut.

In some embodiments, for example, the at least one cutter may bemoveable in a first direction circumferent the obstacle, from atravelling configuration to a rotated configuration, and then in anopposite direction back to the travelling configuration. Alternatively,the at least one cutter may be moveable such that it circumnavigates thedocked obstacle (i.e. it is rotatable through 360 degrees).

In some embodiments, the at least one cutter is moveable relative to theframe. Alternatively, the frame (or a portion of the frame) may movewith the at least one cutter.

In some embodiments, the at least one cutter comprises first and secondcutters. The first and second cutters may, for example, be located toeither side of the dock. In some embodiments, the distance between thefirst and second cutters may be adjustable (e.g. in response to a widthof the obstacle).

In some embodiments, the at least one cutter may further comprise athird cutter. As will be appreciated, in some cutter configurations ofthe first and second cutters (e.g. when they are located to either sideof the dock), they will not overlap, and would otherwise leave a stripof uncut vegetation. The third cutter may, for example, be located in aposition whereby it cuts vegetation at any underlap between the firstand second cutters whilst in the travelling configuration.

In some embodiments (especially where the cutting trajectory defines anarc around the docked obstacle), the dock may be substantially centrallylocated on the frame. In some embodiments, the dock may be at the end ofa channel in the frame (i.e. extending between a periphery of the frameand the dock). The channel may, for example, taper towards the dock inorder to assist an operator to guide the obstacle into the dock.

In some embodiments, the driver comprises a roller adapted to abut theat least one cutter, whereby rolling of the roller moves the at leastone cutter in the cutting trajectory.

In some embodiments, the driver may be actuated upon receipt of theobstacle in the dock. The actuation may, for example, be automatic oncethe obstacle is safely docked. Alternatively, the operator may need tomanually start the driver, but this is only possible once the obstacleis safely docked.

In some embodiments, the at least one cutter depends from a membercarried by the frame. The member may, for example, be rotatable relativeto the frame, whereby rotation of the member causes the at least onecutter to move in the cutting trajectory. The member may, for example,be rotatable by the driver.

In some embodiments, the vegetation cutter may further compriseadditional features such as height adjustment means (i.e. for adjustingthe height of the at least one cutter from the ground) or a vehicleengagement for coupling the vegetation cutter to a vehicle (e.g. to thefront of a vehicle such as a tractor, bobcat or the like).

BRIEF DESCRIPTION OF THE DRAWINGS

Notwithstanding any other forms which may fall within the scope of thepresent invention, specific embodiments of the invention will now bedescribed, by way of example only, with reference to the accompanyingdrawings in which:

FIG. 1 shows a simplified top view of a vegetation cutter in accordancewith a first embodiment of the present invention;

FIG. 2 shows a top view of the cutter of the vegetation cutter of FIG. 1in greater detail;

FIG. 3 shows a simplified top view of a vegetation cutter in accordancewith a second embodiment of the present invention;

FIG. 4 shows the pulley system used to drive the cutters in thevegetation cutter of FIG. 3;

FIG. 5 shows a perspective view of a vegetation cutter in accordancewith a third embodiment of the present invention;

FIG. 6 shows a bottom view of the vegetation cutter of FIG. 5;

FIG. 7 shows a partially-exploded perspective view of the vegetationcutter of FIG. 5, from the underside; and

FIGS. 8A-8G show the sequence of events via which the vegetation cutterof FIG. 5 cuts vegetation circumferent an obstacle.

DESCRIPTION OF EMBODIMENTS

The present invention provides a vegetation cutter for cuttingvegetation circumferent an obstacle. The vegetation cutter comprises aframe comprising a dock for receiving the obstacle; at least one cutterthat is moveable in a cutting trajectory whereby vegetation circumferenta docked obstacle is cut; and a driver for moving the at least onecutter in the cutting trajectory.

The present invention also provides a method for cutting vegetationcircumferent an obstacle. The method comprises manoeuvring a vegetationcutter of the present invention such that the obstacle is received inthe dock; actuating the driver, whereby the at least one cutter moves inthe cutting trajectory and vegetation circumferent the docked obstacleis cut; and manoeuvring the vegetation cutter such that the obstacle isno longer in the dock.

Primary advantages of the present invention over prior art vegetationcutting methods and mowers include a much greater efficiency than is thecase for many of the techniques presently used to cut vegetation inlocations where obstacles need to be mown around, along with asignificantly reduced likelihood of damage to the obstacles comparedwith that when using equipment presently available. Other advantages ofthe present invention are disclosed herein and will be apparent to aperson skilled in the art.

The vegetation cutter of the present invention is intended to cutvegetation surrounding obstacles such as poles, posts, barriers (e.g. asfound on roadsides), trees (e.g. in orchards), vines (e.g. in wineries),and other obstacles commonly found in gardens, parks and the like. Thevegetation cutter may also be used to cut vegetation where there is noobstacles (e.g. when slashing vegetation on the verge of a roadside inbetween roadside delineators, as will be described in further detailbelow).

The vegetation cutter of the present invention may be used to cut anyvegetation of the type which routinely needs to be cut. Examples of suchvegetation include grass, weeds and the like, which are commonly foundson roadsides around the world.

In use of the present invention, vegetation circumferent an obstacle iscut. A vast majority, if not substantially all, of the vegetationcircumferent the obstacle is intended to be cut in accordance with thepresent invention. As will be appreciated, however, it may not benecessary (or appropriate) for all embodiments of the present inventionto completely remove all of the vegetation surrounding an obstacle. Insome applications, for example, it may be sufficient if a significantportion of the vegetation surrounding an obstacle is cut. For example,in an orchard, it would be preferable to leave a small amount ofvegetation surrounding a tree trunk, rather than risk damaging the trunkwith a cutting blade. It is within the ability of a person skilled inthe art to consider relevant factors and make a decision regarding howmuch vegetation circumferent an obstacle can be cut, and how much canremain.

The vegetation cutter of the present invention would typically beassociated with a vehicle which carries the vegetation cutter andenables it to be maneuvered relative to an obstacle. Suitable vehiclesinclude tractors, bobcats or the like. In some embodiments, a dedicatedvehicle may be provided equipped with the vegetation cutter. However, itwould be more common for the vegetation cutter to be adapted forcoupling to a suitable vehicle. Such a vehicle can then be used forother purposes, with the vegetation cutter only being attached whennecessary. In such embodiments, the vegetation cutter may furthercomprise a vehicle engagement for coupling the vegetation cutter to avehicle.

The vegetation cutter may be coupled to a vehicle in any suitablemanner, using any of a variety of known mechanisms. The vegetationcutter may be coupled to the front, rear or sides of a vehicle, althoughthe inventor recognises that it may not be desirable for an operator tohave to keep turning around to monitor the vegetation cutter if it isbehind the vehicle. Such constant turning means the operator spends asignificant amount of time not facing in the direction of travel, whichmay cause hazards if vegetation on a roadside is being cut. Suchconstant turning may also be detrimental to the operator's health. Assuch the vehicle engagement is typically adapted to couple thevegetation cutter to the front of a vehicle, where it is constantly inthe sight of the operator.

The vegetation cutter of the present invention comprises a framecomprising a dock for receiving the obstacle. The frame may have anyform that is compatible with the vegetation cutter's intended use, aswell as with any other features of the vegetation cutter. Typically, theframe will provide a cover that wholly encompasses the cuttingtrajectory of the at least one cutter such that there is no risk of anoperator (or another person) accidentally being struck by a cutter (orhit with any debris struck by the cutter). Typically, other componentsof the vegetation cutter will depend from an underside of the frame.

The frame would typically remain substantially stationary once theobstacle has been received in the dock and whilst the at least onecutter is moving in the cutting trajectory. However, a portion of theframe (e.g. an inner portion of the frame) may also be capable of movingeither along with or independently of the at least one cutter. Thisportion of the frame may, for example, be integrally formed with the atleast one cutter and movement of this portion of the frame causemovement of the cutter in the cutting trajectory.

The frame may have fittings that enable other components to be attachedto it. For example, it may be desirable for the vegetation cutter toinclude a means for preventing stones flicked up by the cutter(s) fromflying out onto a roadway, and the frame may therefore includeattachment points for short lengths of chain to dangle down and providea screen to either block such projectiles or at least slow them down. Itmay also be desirable for the vegetation cutter to include heightadjustment means for adjusting the height of the at least one cutter.Such height adjustment means may be provided attached to the frame, forexample, in the form of one or more adjustable height wheels. The heightof the at least one cutter (i.e. its distance from the ground) may bemanually adjusted (e.g. using a winding handle) or automaticallyadjusted (e.g. by the operator or in response to operating parameterssuch as the angle or unevenness of the ground being mowed, etc.). Thesewheels may be positioned distal to any vehicle engagement in order tosupport the weight of the vegetation cutter and to lessen the torsionalforces on the vehicle.

The frame may be formed of any suitable material, given its intendeduse, and would typically be formed from a corrosion resistant anddurable metal.

The frame has a dock for receiving the obstacle. The dock may have anyappropriate shape and configuration, provided that the obstacle isreceivable therein. In use, the object may be received in the dock inany manner. Typically, however, the operator of the vegetation cutterwill orient the obstacle with respect to the dock, and then drive thevegetation cutter towards the obstacle such that it is received in thedock.

The dock may, for example, be defined by the end of a channel whichextends from a periphery to an interior of the frame. In use, theoperator would align the channel with the obstacle and then drive thevegetation cutter towards the obstacle such that the obstacle passesthrough the channel and into the dock. The channel may, in someembodiments, be tapered towards the dock in order to facilitate thisoperation. Typically, the edges of the channel would be rounded in orderto ensure that there was no chance of the obstacle catching on theframe. In some embodiments, the edges of the channel may be reinforced.

In some embodiments, the shape (e.g. the width) of the dock (andchannel) may be adjustable in order for it to accommodate widerobstacles, or to more securely retain smaller obstacles (e.g. for moreprecise circumferential cutting, where the distances between thecutter(s) and obstacle would be less).

The dock may be located at any position on the frame, provided thatmovement of the at least one cutter in its cutting trajectory iseffective to cut vegetation circumferent the docked obstacle (andideally there being no risk of the cutter(s) contacting the obstacle).In some embodiments, and especially when the at least one cutter rotatesaround the docked obstacle, the dock is substantially centrally locatedon the frame.

In some embodiments, the dock may be adapted to securely receive theobstacle such that, once in position in the dock, the obstacle is heldstationary with respect to the frame whilst the cutting operation iscarried out. As would be appreciated, this would even further reduce thelikelihood of damaging the obstacle, and would also provide a “failsafe” function, whereby the vegetation cutter cannot be moved until suchtime as the vegetation circumferent the object has been completely cut.

In order to securely receive the obstacle, the vegetation cutter may,for example, have a gate adapted to close once the obstacle is receivedin the dock. The gate may, for example, be hinged or otherwise pivotwith respect to the frame to close once the obstacle is received in thedock.

The vegetation cutter of the present invention also has at least onecutter that is moveable in a cutting trajectory whereby vegetationcircumferent a docked obstacle is cut. The at least one cutter may, forexample, be moveable relative to the frame from a travellingconfiguration in a cutting trajectory whereby vegetation circumferent adocked obstacle is cut.

The vegetation cutter may include one or more cutters, depending on itsintended use. For example, if the vegetation cutter is intended to trimvegetation around trees in an orchard, it may only need one cutterhaving a cutting trajectory that takes it around the outside of a dockedtree trunk. However, vegetation cutters intended for use in slashingvegetation on a roadside would ideally be able to cut a wider path thanwould be feasible with just one cutter, and may therefore have twocutters (i.e. first and second cutters) spaced apart from each other. Astwo cutters that are laterally adjacent to each other (with respect to adirection of travel) would not be able to overlap with each other (atthe same height, at least), if it is important that a strip ofvegetation not be left, then a third cutter may also be provided to cutvegetation at any underlap between the first and second cutters whilstin the travelling configuration.

The cutter(s) (e.g. first, second and third cutters, etc.) are normallyarranged in a travelling configuration, where they are capable ofcutting vegetation (if actuated), but they do not interfere with thedocking process of an obstacle. Upon actuation of the driver, however,the cutter(s) are moved from the travelling configuration in theircutting trajectory, and vegetation circumferent the docked obstacle iscut. Once the vegetation circumferent the obstacle has been cut, thecutter(s) return to their travelling configuration (i.e. so that theobstacle can be undocked).

The cutter(s) may be located at any position whilst in their travellingconfiguration, provided that they do not interfere with other componentsof the vegetation cutter (or, as noted above, any obstacle in the dockor which is in the process of being received in the dock). Ideally, whenthe vegetation cutter has two more cutters, the cutters in theirtravelling configuration will define a cutting zone that is as wide aspossible, and which has no or very little underlap (i.e. which wouldleave a strip of uncut vegetation). Typically, in embodiments with twoor more cutters (and especially when the cutters are rotatable relativeto the frame), the first and second cutters are located to either sideof the dock, with their cutting zones extending to the dock. Movement(e.g. rotation) of these cutters in the cutting trajectory causes themto circumnavigate the docked obstacle, with their blades being closeenough to cut substantially all the vegetation around the obstacle, butnot so close that they physically contact the obstacle.

The cutter(s) may have any known form, provided that they are operableto cut vegetation. In some embodiments, for example, each of the atleast one cutter has a rotatable central shaft from which at least one,but typically two or more cutting blades project. The cutter mayalternatively be a rotating disk having one, two, three or four cuttingblades affixed thereto. In other embodiments, the cutter may compriseother means for cutting, such as scissor-action members, rotating flailsor the like. In some forms, combinations of different cutters may beused, if such a combination provides an advantage.

The at least one cutter may also have a wire which is longer than the atleast one cutting blade such that any residual vegetation circumferentthe docked obstacle (i.e. which will not be reached by the cutting bladewithout risking damage to the obstacle) is trimmed. In this manner thecutting blade does the majority of the cutting, with the wire trimmingany vegetation just out of reach of the blade. As would be appreciated,such a configuration may be appropriate in circumstances where it isnecessary to cut substantially all of the vegetation circumferent anobstacle, but the obstacle could easily be damaged if impacted by(relatively heavy) a cutting blade. In some embodiments, the at leastone cutter (or one of the cutters) may include only such a wire,although such a vegetation cutter may be less durable.

The at least one cutter may, in some embodiments, also have a guardadapted to bear against the docked obstacle and guide the cutter(s)about the obstacle whilst moving in the cutting trajectory. Again, thismay help to prevent a cutting blade accidentally coming into contactwith a docked obstacle, and especially if the obstacle has an irregularshape (e.g. as may be the case, for example, with tree trunks). Theguard may, for example, be a metal ring located about the circumferenceof the circle defined by the spinning cutting blade.

The first and second (and third, etc.) cutters may be fixed in relationto each other (and the vegetation cutter). Alternatively, a distancebetween the first and second (etc.) cutters may be adjustable (e.g. inresponse to a width of the obstacle), for example, by providing a trackalong which the cutters can slide. Adjusting the distance between thesecutters may be achieved using mechanical means (e.g. by unscrewingfasteners which hold the cutters in position, moving the cutters andrefastening the fasteners) or automatic means (e.g. using a step motor).

The at least one cutter may be moved (e.g. with respect to the frame andstarting from its travelling configuration) in its cutting trajectory(and back, if the cutter(s) do not completely circumvent the obstacle)using any suitable means. Typically, the at least one cutter will bemoveable (e.g. rotatable relative to the frame) such that the cuttingtrajectory defines an arc around the docked obstacle, as such a movementis mechanically relatively easy to perform and many obstacles aregenerally circular in shape. It will be appreciated, however, that inother embodiments, cutting trajectories may include squares, ellipses,triangles or the like.

In embodiments where there are two or more cutters, the cutters may movein the same cutting trajectory (e.g. as is the case when they all dependfrom a single member), or each of the cutters may be independentlymoveable in its own trajectory, with the overall result being thatvegetation circumferent the docked obstacle is cut. Each of the cuttersmay be independently operated, but would more typically be driven by thesame drive system.

The at least one cutter may, for example, be moved in a first directioncircumferent the docked obstacle from its travelling configuration to arotated configuration, and then in an opposite direction back to thetravelling configuration. In some embodiments, it may subsequently benecessary for the cutter to be moved in the opposite direction from thetravelling configuration to a second rotated configuration, and then inthe original direction back again to the travelling configuration inorder for all of the vegetation circumferent the obstacle to be cut.Alternatively, the at least one cutter may be moveable such that itcircumnavigates the docked obstacle (e.g. it rotates through 360 degreesrelative to the frame).

Typically, the at least one cutter is moveable relative to the frame.That is, the frame of the vegetation cutter remains substantiallystationary once the obstacle has been docked and whilst the at least onecutter moves from its travelling configuration through the cuttingtrajectory and back to the travelling configuration. As noted above,however, in some embodiments, a portion of the frame (e.g. an innerportion of the frame) may also be capable of moving with the at leastone cutter. In such embodiments, the at least one cutter moves relativeto the portion of the frame which remains stationary.

The at least one cutter may be coupled to any part of the vegetationcutter, provided that it can perform the functions described herein. Insome embodiments, the at least one cutter may depend from a membercarried by the frame. The member may have any shape and size, providedthat it can interrelate with the frame (especially the dock) and othercomponents of the vegetation cutter. Typically, the member will have asimilar footprint to the frame (or at least an interior of the frame),and will be coupled to an underside of the frame. The member may, forexample, be substantially planar and circular in cross section. Themember may, for example, have a dock (and channel, if present) which iscomplimentary in shape to the dock (and channel) of the frame.

The member may be carried by the frame using any mechanism that enablesthe member to move in the manner required for the at least one cutter tomove in the cutting trajectory. The member may, for example, be moveablycoupled to the frame. In embodiments where the at least one cutter isrotatable relative to the frame, for example, the member may berotatable relative to the frame and rotation of the member cause the atleast one cutter to move in the cutting trajectory. Tracks or channelsmay be provided as necessary on the frame and/or member to achieve thisfunctionality.

The member may, for example, be rotatably coupled to the frame at aperiphery of the member. For example, the periphery of the member (orframe) may have a plurality of frame (or member) engagements forengaging the frame (or member). Such frame/member engagements enable theframe and member to rotatably move with respect to each other,preferably in as frictionless a manner as possible. Examples of suitableframe/member engagements include ball bearings and rollers. Tracks orchannels adapted to receive and retain such ball bearings and rollersmay be provided on the other of the frame and member.

The vegetation cutter of the present invention also has a driver formoving the at least one cutter in the cutting trajectory. Any driverthat is suitable for use in a vegetation cutter and which is capable ofmoving the cutter(s) in their cutting trajectory may be used. Suitabledrivers may, for example, be actuated by electric or hydraulic motorsand may include belts or chains, rollers etc.

In some embodiments, the driver includes a roller adapted to abut the atleast one cutter, whereby rolling of the roller moves the at least onecutter in the cutting trajectory. In embodiments of the presentinvention where the vegetation cutter includes a member from which theat least one cutter depends, the member may be moveable (e.g. rotatable)by the driver. In such an embodiment, the driver may, for example,include a roller adapted to abut the member.

The driver may be actuated upon receipt of the obstacle in the dock. Forexample, the driver may be automatically actuated upon safe receipt ofthe obstacle in the dock. Alternatively, the driver may be disableduntil such time as the obstacle is safely received in the dock, with theoperator only being able to manually actuate it once the obstacle isdocked in order to prevent accidental circumferential cutting before theobstacle is appropriately positioned.

In use, a vegetation cutter of the present invention may, in someembodiments, be manoeuvred such that the obstacle is received in thedock. Once this is achieved, the driver may be actuated such that itdrives the at least one cutter in the cutting trajectory and vegetationcircumferent the docked obstacle is cut. Typically, the frame of thevegetation cutter would remain stationary at this time. Once thevegetation circumferent the docked obstacle has been cut, the dockingprocess can be reversed by the vegetation cutter manoeuvring such thatthe obstacle is no longer in the dock.

In another general form, disclosed herein is a vegetation cutter forcutting vegetation circumferent an obstacle, the vegetation cutteradapted for cutting vegetation within a cutting area at least partiallycircumferent the obstacle. Advantageously, the vegetation cutter isadapted to cut vegetation proximate an obstacle in an efficient manner,while avoiding contact with the obstacle.

Preferably, cutting means are adapted to travel along a cuttingtrajectory, the cutting trajectory at least partially defining thecutting area. Preferably, a portion of the trajectory defines acircumferential arc. Advantageously, the cutting trajectorycircumscribes the obstacle allowing for the vegetation in the path ofthe trajectory to be cut.

Preferably, a cutter assembly is adapted for moving the cutting meansalong the cutting trajectory. Advantageously, the cutter assemblycomprises means for moving the cutting means along the cuttingtrajectory, such as by using hydraulic motors, pulleys, drivetrains andthe like.

Preferably, the cutter assembly is rotatable. Advantageously, the cutterassembly may be adapted to rotate traverse about the obstacle.

Preferably, the cutter assembly is rotatable from a restingconfiguration in a first direction and rotatable in a second directionto return to the resting configuration. Advantageously, the cutterassembly may be adapted to engage the obstacle in the restingconfiguration, cut about the obstacle in rotating in the first andsecond directions, and disengage the obstacle once returned to theresting configuration.

Preferably, the cutter assembly is rotatable through 360 degrees.Advantageously, the vegetation area is adapted to rotate entirely aboutthe obstacle.

Preferably, the cutting means is adapted to travel with respect to thecutting assembly. Advantageously, the cutting means is adapted to movewhile the cutting assembly remains stationery. The cutting assembly maycomprise guide rails defining a path through which the cutting meanstravel in the cutting process.

Preferably, the cutter assembly is substantially disk shaped.

Preferably, the cutter assembly is horizontally orientated.Advantageously, the horizontal alignment of the cutter assembly mayallow the vegetation to be cut at a uniform height for the entirevegetation area.

Preferably, the cutter assembly comprises an obstacle accommodationadapted for at least partially accommodating the obstacle therein.Advantageously, the obstacle accommodation is located centrally of thevegetation cutter such that the vegetation cutter can receive theobstacle therein and cut about the obstacle. Preferably, the obstacleaccommodation is adapted for securing the obstacle at an accommodatedposition and wherein the cutter assembly is adapted for rotating atleast partially about the accommodated position. Advantageously, theobstacle may be secured within the obstacle accommodation. Preferably,the obstacle accommodation comprises a gate for securing the obstacletherein. Advantageously, the gate is adapted for securing the obstaclewithin the obstacle accommodation.

Preferably, the cutting means comprises at least one guide adapted tobear against the obstacle to guide the cutting means about the obstacle.Advantageously, the at least one guide is adapted for allowing thecutting means to locate close to the obstacle. Preferably, at least oneguide comprises a roller. Advantageously, the roller reduces friction inthe guiding of the cutting means about the obstacle.

Preferably, the vegetation cutter comprises a frame wherein the cutterassembly is rotatably coupled to the frame. Advantageously, the cutterassembly may be adapted to rotate freely while the frame remainsstationary. Preferably, the cutter assembly is rotatably coupled to theframe at a periphery of the cutter assembly. Advantageously, theperiphery frame is suited to applying rotational torque to the cutterassembly. Preferably, the periphery of the cutter assembly comprises atleast one frame engagement for engaging the frame. Preferably, the frameengagement comprises a roller. Advantageously, the roller allows for thereduction of friction in the cutter assembly rotating relative to theframe. Preferably, the roller comprises teeth. Advantageously, the teethallow for engaging the cutter assembly in applying rotational torque tothe cutter assembly. Preferably, the roller is driven. Advantageously,the rotation of the cutter assembly may be automated.

Preferably, the cutting means comprises a first and a second cutter.Advantageously, an additional cutter allows for a greater cutting area.Preferably, in the first and the second cutter are offset bysubstantially 45 degrees.

Preferably, the cutting means further comprises a third cutter.Preferably, the third cutter is offset from the second cutter bysubstantially 45 degrees.

Preferably, the vegetation cutter further comprises height adjustmentmeans for adjusting the height of the cutter assembly. Advantageously,the height adjustment means allows for the adjustment of the cuttingheight of the cutter assembly.

Preferably, the vegetation cutter further comprises a vehicle engagementfor coupling the vegetation cutter to a vehicle. Advantageously, thevegetation cutter may be coupled to a driven vehicle, such as a tractorand the like.

Specific embodiments of vegetation cutters in accordance withembodiments of the present invention will now be described withreference to the Figures. It should be noted in the followingdescription that the same reference numerals may be used when describingdifferent embodiments to denote the same or similar features.

Referring firstly to FIG. 1, shown is a simplified form of a vegetationcutter 150 which is adapted for cutting vegetation at least partiallycircumferent an obstacle 110. The vegetation cutter 150 can be used tocut vegetation such as grass, weeds and the like, and is adapted to cutvegetation surrounding obstacles 110 such as poles, posts, barriers andtrees such as those found in orchards, gardens, parks and the like.

The vegetation cutter 150 has a frame, which is schematically shown asframe 140, which is substantially disk shaped. However, in otherembodiments, the shape of the vegetation cutter (or its frame) may be acube, rectangular prism or the like. It will be appreciated that frame140, as shown in FIG. 1 is shown in a simplified form and, as will bedescribed below in respect of other embodiments, would normally includea number of other features such as a peripheral portion, wheels,supports, etc.

The vegetation cutter 150 also has at least one cutter in the form of asingle cutter 105. In the embodiment shown, the cutter 105 is a rotatingdisk having cutting blades (not shown) affixed thereto. However, inother embodiments, the cutter 105 may comprise other means for cutting,such as scissor-action members, rotating flails or the like. The cutter105 is adapted to travel along a cutting trajectory 120 which, in FIG.1, is circular because the cutter 105 circumvents the obstacle 110.However, in other embodiments, cutting trajectories may comprisesquares, ellipses, triangles or the like. The vegetation cutter 150 istypically substantially horizontally oriented (with respect to theground) such that the cutter 105 is substantially parallel to theground. In this manner, the vegetation is cut to a uniform height acrossthe cutting area (i.e. the area defined by the frame 140 once the cutter105 has moved through the cutting trajectory 120, or by the cutter 105if the vegetation cutter 150 is moving forward with the cutter 105 inits travelling configuration, as shown in FIG. 1).

The vegetation cutter 150 also has a centrally located dock in the formof obstacle accommodation 160. A tapered channel leads from a peripheryof the frame 140 to its centre, with the obstacle accommodation 160being shaped to receive the obstacle 110 therein such that the frame 140and the cutter 105 are able to rotate about to the obstacle 110, as willbe discussed below.

Furthermore, the vegetation cutter 150 may comprise a gate assembly 130wherein the obstacle 110 is secured within the vegetation cutter 150 byclosing the gate assembly 130. The gate assembly 130 may be attached tothe frame 140 through the use of hinges, latches or the like. As isshown in FIG. 1, the gate assembly 130 may move laterally into theclosed configuration so as to allow a snug fit against the obstacle 110.

In the vegetation cutter 150, the gate assembly 130 is configurable inan open configuration for allowing the passage of the obstacle 110therethrough, and in a closed configuration so as to allow for thesecurement of the obstacle 110 within the obstacle accommodation 160.The configuration of the gate may be automated by the control box 315(see FIG. 2) where, upon sensing that an obstacle 110 has been receivedin the obstacle accommodation 160, the control box 315 causes the gateassembly 130 to close. Once a cutting operation has been completed bythe cutter 105 (as described below), the control box 315 may cause thegate assembly 130 to open to release the obstacle 110. In certainembodiments (not shown), however, the gate may be detachable from theframe.

The cutter 105 is coupled to the frame 140 in any manner whereby thecutter 105 can be caused to move along (cutting any vegetation) thecutting trajectory 120 and circumvent the obstacle 110. In a firstembodiment, the cutter 105 is fixed to the frame 140, and the frame 140is adapted to rotate, for example, with respect to a stationary portionaround the periphery of the frame (not shown). Rotation of frame 140thus causes cutter 105 to move along the cutting trajectory 120.Alternatively, in a second embodiment, the frame 140 remains stationeryand the cutter 105 is adapted to travel with reference to the frame 140along the cutting trajectory 120.

In one form of the first embodiment, the frame 140 (and cutter 105) arerotatable from a travelling configuration (e.g. as shown in FIG. 1 withthe opening for the obstacle accommodation 160 pointing forwards) in afirst direction to a predetermined position, and then rotatable in asecond direction to return to the travelling configuration. In thismanner, the vegetation cutter 150 is adapted to engage the obstacle 110while the cutter 105 is in its travelling configuration, and rotate inthe first and second directions such that the cutter 105 is able to cutabout the obstacle 110 before the frame 140 returns to its travellingconfiguration. As will be appreciated, in embodiments with only onecutter (e.g. as shown in FIG. 1), then it may be necessary for the frame140 (and cutter 105) to perform another rotation, this time in the otherdirection, in order for the cutter 105 to cut all the vegetationcircumferent the obstacle 110.

In an alternative form of the first embodiment, the frame 140 (andcutter 105) is rotatable through 360 degrees so as to return to itstravelling configuration having circumvented the obstacle 110 by movingin one direction only.

In the second embodiment, the frame 140 is adapted to remain stationery,with the cutter 105 being adapted to travel with reference to frame 140,such as by being guided by rails and the like (see FIG. 2). Similar tothe first embodiment, the cutter 105 may move from its travellingconfiguration in a first direction to a predetermined point and thenrotate back the travelling configuration, or it may move through 360degrees so as to return to its travelling configuration havingcircumvented the obstacle 110 by moving in one direction only.

The gate assembly 130 is more easily adapted for the first embodiment,wherein the frame 140 is adapted to rotate. However, the gate assembly130 may also be used for the embodiment wherein the cutting means 105 isadapted to travel with respect to the frame. In this manner, the gateassembly 130 is adapted to complete the guide rails (as discussed below)when the gate assembly 130 is in the closed configuration so as to allowthe passage of the cutter 105 therepast.

Referring now to FIG. 2, a more detailed view of cutter 105 is shown. Inparticular, FIG. 2 shows a top view of part of vegetation cutter 150,and in particular the drive mechanism for cutter 105. The rotatingblades (not shown) of cutter 105 may be driven by a drive belt 220 anddriveshaft 205 from a motor (e.g. a petrol or an electric motor M), forexample. In FIG. 2, the upper portion of cutter 105 is shown as acircular plate, which protects the components thereon (e.g. as shown inthis Figure) from cut vegetation, rocks and the like.

In the embodiment shown, the cutter 105 travels along its cuttingtrajectory by moving relative to the frame 140 in an arc-like trajectoryaround the obstacle 110. In this regard, an inner 140 a and outer 140 bperiphery of frame 140 is provided with tracks or a channel into whichis received one or more roller guides 310 mounted on the cutter 105.Movement of the cutter 105 in its trajectory may be driven by ahydraulic motor 320 adapted to drive a tooth roller 215 coupled to thecutter 105 and with its teeth against a corresponding tooth rack 325 inthe outer 140 b frame. The hydraulic motor 320 may be used to power thetooth roller 215 such that torque is applied to the corresponding toothrack 325 thereby causing the cutter 105 to move along the frame outerperiphery 140 b and hence rotate around the obstacle 110. In otherembodiments, however, the tooth roller 215 may be driven by other meansincluding via an electrical motor, manual force and the like. Thevegetation cutter 150 may also include an electronic control box 315 forautomating the movement of the cutter 105.

In use, the cutter 105 is driven in its circumferential cuttingtrajectory when the tooth roller 215 is turned by the hydraulic motor320. The cutter 215 will move around the obstacle 110 along thetracks/channels in the inner 140 a and outer 140 b peripheries of frame140, thereby cutting vegetation circumferent the obstacle 110. Whilstthese tracks do not continue over the obstacle accommodation 160 (notshown in FIG. 2), they may be provided as part of the gate assembly 130(also not shown in FIG. 2) to complete the circle. Alternatively, theroller guides 310 mounted on the cutter 105 may be spaced such that theycan span the gap in the tracks due to the obstacle accommodation, with asufficient number of the cutter's roller guides 310 remaining in thetracks at all times to hold the cutter 105 stable.

FIG. 3 shows a simplified form of a vegetation cutter 500 including atleast one cutter in the form of cutters 105 a, 105 b and 105 c. Cutters105 a and 105 b are offset from one another by 90 degrees relative tothe obstacle 110. Cutters 105 c and 105 c are offset from one another by90 degrees relative to the obstacle 110. In alternative embodiments (notshown), the cutters 105 a, 105 b and 105 c may be offset from each otherby any angle, provided there is adequate distance between the cutters.Ideally, the cutters will be arranged to provide an optimal vegetationcutting configuration (as is the case in FIG. 3, where cutter 105 b ispositioned to cut vegetation that passes between cutters 105 a and 105 cwhen in the travelling configuration depicted in the figure).

Vegetation cutter 500 also has four height adjustment means 505,distributed equidistant about the frame 140. In alternative embodiments(not shown), the vegetation cutter may contain a different number ofheight adjusters. For example, when the vegetation cutter is mountedonto the front of a tractor, only two height adjusters at the front ofthe vegetation cutter may be required. The height adjustment means 505may be adjustable in order to alter the distance between the cutters 105and the ground, and comprise one or more wheels for engaging the ground.

FIG. 4 shows a member in the form of cutter assembly 700 from whichcutters 105 a, 105 b and 105 c depend. Cutter assembly 700 may rotatewith respect to the frame 140 (not shown in FIG. 4) of the vegetationcutter, in a manner similar to that described above (and below). Thecutter assembly 150 may therefore include a control box 315 andhydraulic motor 320 for driving the rotation of the cutter assembly 700(and hence cutters 105 a, 105 b and 105 c) with respect to theframe/vegetation cutter.

Cutter assembly 700 has a drive belt system 702 for driving cutters 105a, 105 b and 105 c using a single motor 715. The system 702 has acommunal drive belt 705 which drives a respective driveshaft of each ofcutters 105 a, 105 b and 105 c. The communal drive belt mayalternatively be a drive chain or the like. The motor 715 may beelectrically powered but is preferably a petrol motor. In embodimentswhere the vegetation cutter is adapted for coupling to a tractor, thecommunal drive belt 705 may be driven by an actuation mechanism of thetractor.

The cutter assembly 700 may also have one or more guides 710 adapted tobear against an obstacle (not shown in FIG. 4) so as to prevent ormitigate physical contact between cutter 105 a, 105 b or 105 c and thedocked obstacle. Preferably, the one or more guides 710 compriserollers, such that the cutter assembly 700 may rotate about the dockedobstacle in a substantially frictionless manner.

FIGS. 5 to 7 show a vegetation cutter in accordance with a thirdembodiment of the present invention in the form of vegetation cutter800. Vegetation cutter 800 has a frame 802, which is generally square inshape. Frame 802 has a skirt 804 which extends substantially around itsperiphery. Frame 802 also has a dock 806 which is located at the centreof the frame 802 and at the end of a tapering channel 808. Attached toframe 802 are a mounting assembly 810, via which vegetation cutter 800can be mounted to a tractor, bobcat or the like (not shown), and twowheels 812, 812. Wheels 812, 812 support and stabilise the side of thevegetation cutter 800 distal to the tractor, and can also be used toadjust the height of the vegetation cutter 800. Also attached to frame802 are skids 814, 814, which can help to prevent stones from beingejected sideways from the vegetation cutter, and dangling chains 816,which define a screen for preventing stones from being ejected fromunderneath the vegetation cutter (or at least slowing ejected stonesdown so that they are less likely to cause damage).

Vegetation cutter 800 also has a member in the form of rotating cuttingassembly 818, from which at least one cutter in the form of cutters 820a, 820 b and 820 c depend. Cutters 820 a, 820 b and 820 c each include arotatable central shaft and cutting blades 821 a, 821 b and 821 c,respectively. Rotation of the central shafts causes the cutting bladesto cut any vegetation which they make contact with. Cutters 820 a, 820 band 820 c may either be independently actuated (e.g. via three separatemotors), or may be actuated via a single motor and drive system such asthat described above in respect of the second specific embodiment.

Member 818 is substantially planar and circularly shaped, and isslightly smaller than frame 802 (as can best be seen in FIG. 6).Although not shown in the Figures, the driving assembly, control boxesand the like are located on top of rotating cutting assembly 818(underneath frame 802). Member 818 also has a channel 822 therethrough,which compliments tapering channel 808 and dock 806, with the sides ofthe channel having a wall 824 that defines a wall of the channel (andprevents cut vegetation etc. from easily getting into the space abovethe cutting assembly 818 and below the frame 802). When in thetravelling configuration (as will be described below), channels 808 and822 are substantially in alignment, and are ready to receive an obstacletherethrough.

Although not shown, wall 824 may also extend downwardly (in use) towardsthe ground, which provides a safety feature to prevent a person's handor foot from being able to readily enter into a space where the cuttersmay be operating.

Rotating cutting assembly 818 is rotatable with respect to frame 802. Aplurality of bearings 826 are provided around the periphery of cuttingassembly 818, and these are adapted to rotatably couple with acomplimentary track 828 provided underneath the frame 802. The ends oftrack 828 at either side of channel 808 are open so that, duringrotation, a bearing 826 may exit track 828 on one side of the channeland then renter track 828 on the other side of the channel. As the vastmajority of the bearings 826 will be in the track 828 at any given timeduring rotation, this is unlikely to destabilise the cutting assembly818 to any significant extent.

Cutters 820 a and 820 b are positioned either side of the dock 806 and,as the cutting assembly 818 is rotated, will cut any vegetationcircumferent an obstacle held in the dock 806. In the travellingconfiguration (discussed below), a strip of vegetation about as wide asthe dock will not be cut by cutters 820 a and 820 b, and a third cutter820 c is therefore provided to cut vegetation at this underlap.

FIGS. 8A-8G shows the sequence of events via which a slasher 900, whichhas a vegetation cutter 800 attached to its front, cuts vegetationcircumferent a roadside post 902.

In FIG. 8A, the slasher 900 cuts a strip of vegetation 904 adjacent aroadside 906 up to the post 902. Vegetation is cut because cutters 820a, 820 b and 820 c are in their travelling configuration and are allspinning at a rate whereby vegetation which makes contact with blades821 a, 821 b and 821 c (see FIG. 6) is cut.

In FIG. 8B, the slasher 900 is driven onto the post 902 such that thepost passes through tapering channel 808 to the dock 806 its end, andthen stopped.

In FIG. 8C, whilst the slasher 900 remains stationary and the post 902safely positioned in the dock 806, the rotating cutting assembly 818 iscaused to rotate with respect to frame 802. This rotation causes thecutters 820 a and 820 b to rotate in an arc circumferent the post 902,cutting any vegetation which makes contact with blades 821 a and 821 b.Once the leading cutter has been rotated far enough around the post 902that all vegetation circumferent the post has been cut then, in FIG. 8D,the rotating cutting assembly 818 is caused to rotate back to itstravelling configuration.

It should be noted that the steps shown in FIGS. 8C and 8D may beperformed in other ways. For example, in some embodiments, the rotatingcutting assembly may rotate by 360 degrees to come back to thetravelling configuration. Alternatively, the rotating cutting assemblymay rotate part way around the post in a first direction, and then in anopposite direction, past the travelling configuration and around thepost until all vegetation circumferent the post has been cut, beforefinally rotating back (in the first direction) to the travellingconfiguration.

In FIG. 8E, the slasher 900 disengages from the post 902 by reversingaway from it until the post exits the channel 808 and the slasher isable to manoeuvre around the post 902 (in FIG. 8F). In FIG. 8G, theslasher 900 continues along the side of the road 906, cutting vegetationas it goes, until it reaches the next post (not shown), whereupon theprocess is repeated.

It will be appreciated that numerous advantages can be provided byspecific examples of vegetation cutters in accordance with embodimentsthe present invention. Such advantages include (but are not limited to):

-   -   It engages the post during the normal slashing process and cuts        the grass immediately around the reflector post or traffic        management post.    -   It removes the need for whipper snipper manual labour for the        removal of vegetation around the post, thus saving considerable        labour costs.    -   It reduces or removes the need for chemical spraying around        posts as the cutting of the vegetation around the posts can be        performed each and every time the general area of the verge is        cut, thus saving considerable cost and improving environmental        outcomes.    -   It substantially eliminates the risk of damage to and        destruction of posts, saving money on repairs, replacement and        maintenance, and ensuring that posts are always operating to the        relevant standards.    -   It substantially reduces WHS (Workplace Health and Safety)        issues for tractor operators by being capable of being mounted        on the front of the tractor rather than the rear. The vast        majority of the operator's functions therefore take place in        front of rather than behind the operator.    -   It substantially reduces road carriageway incursion during the        slashing process by engaging the post head on and not having to        manoeuvre the rear mounted slasher around the post, which is        often onto the carriageway.

INTERPRETATION Embodiments

Reference throughout this specification to “one embodiment” or “anembodiment” means that a particular feature, structure or characteristicdescribed in connection with the embodiment is included in at least oneembodiment of the present invention. Thus, appearances of the phrases“in one embodiment” or “in an embodiment” in various places throughoutthis specification are not necessarily all referring to the sameembodiment, but may. Furthermore, the particular features, structures orcharacteristics may be combined in any suitable manner, as would beapparent to one of ordinary skill in the art from this disclosure, inone or more embodiments.

Similarly it should be appreciated that in the above description ofexample embodiments of the invention, various features of the inventionare sometimes grouped together in a single embodiment, figure, ordescription thereof for the purpose of streamlining the disclosure andaiding in the understanding of one or more of the various inventiveaspects. This method of disclosure, however, is not to be interpreted asreflecting an intention that the claimed invention requires morefeatures than are expressly recited in each claim. Rather, as thefollowing claims reflect, inventive aspects lie in less than allfeatures of a single foregoing disclosed embodiment. Thus, the claimsfollowing the Detailed Description of Specific Embodiments are herebyexpressly incorporated into this Detailed Description of SpecificEmbodiments, with each claim standing on its own as a separateembodiment of this invention.

Furthermore, while some embodiments described herein include some butnot other features included in other embodiments, combinations offeatures of different embodiments are meant to be within the scope ofthe invention, and form different embodiments, as would be understood bythose in the art. For example, in the following claims, any of theclaimed embodiments can be used in any combination.

Different Instances of Objects

As used herein, unless otherwise specified the use of the ordinaladjectives “first”, “second”, “third”, etc., to describe a commonobject, merely indicate that different instances of like objects arebeing referred to, and are not intended to imply that the objects sodescribed must be in a given sequence, either temporally, spatially, inranking, or in any other manner.

Specific Details

In the description provided herein, numerous specific details are setforth. However, it is understood that embodiments of the invention maybe practiced without these specific details. In other instances,well-known methods, structures and techniques have not been shown indetail in order not to obscure an understanding of this description.

Terminology

In describing the preferred embodiment of the invention illustrated inthe drawings, specific terminology will be resorted to for the sake ofclarity. However, the invention is not intended to be limited to thespecific terms so selected, and it is to be understood that eachspecific term includes all technical equivalents which operate in asimilar manner to accomplish a similar technical purpose. Terms such as“forward”, “rearward”, “radially”, “peripherally”, “upwardly”,“downwardly”, and the like are used as words of convenience to providereference points and are not to be construed as limiting terms.

Comprising and Including

In the claims which follow and in the preceding description of theinvention, except where the context requires otherwise due to expresslanguage or necessary implication, the word “comprise” or variationssuch as “comprises” or “comprising” are used in an inclusive sense, i.e.to specify the presence of the stated features but not to preclude thepresence or addition of further features in various embodiments of theinvention.

Any one of the terms: including or which includes or that includes asused herein is also an open term that also means including at least theelements/features that follow the term, but not excluding others. Thus,including is synonymous with and means comprising.

Scope of Invention

Those of skill in the art will appreciate that numerous modifications orchanges can be made to the particular embodiments described abovewithout departing from the scope of the invention. All suchmodifications and changes are intended to be included within the scopeof the appended claims.

Although the invention has been described with reference to specificexamples, it will be appreciated by those skilled in the art that theinvention may be embodied in many other forms.

INDUSTRIAL APPLICABILITY

It is apparent from the above, that the arrangements described areapplicable to the vegetation maintenance industries.

The invention claimed is:
 1. A vegetation cutter for cutting vegetationcircumferent an obstacle, the vegetation cutter comprising: a framecomprising a dock for receiving the obstacle; a member carried by theframe and rotatably coupled to the frame at a periphery of the member;at least one cutter that depends from the member, the at least onecutter being moveable relative to the frame in a cutting trajectorywhereby vegetation circumferent a docked obstacle is cut; and a driverfor moving the member, whereby the at least one cutter moves in thecutting trajectory.
 2. The vegetation cutter of claim 1, wherein the atleast one cutter is moveable such that the cutting trajectory defines anarc around the docked obstacle.
 3. The vegetation cutter of claim 1,wherein the at least one cutter is moveable in a first directioncircumferent the obstacle from a travelling configuration to a rotatedconfiguration, and then in an opposite direction back to the travellingconfiguration.
 4. The vegetation cutter of claim 1, wherein the at leastone cutter comprises first and second cutters, and wherein the first andsecond cutters are located to either side of the dock.
 5. The vegetationcutter of claim 4, wherein the at least one cutter further comprises athird cutter.
 6. The vegetation cutter of claim 1, wherein the at leastone cutter comprises a rotatable central shaft from which at least onecutting blade projects.
 7. The vegetation cutter of claim 6, wherein theat least one cutter further comprises a guard adapted to bear againstthe docked obstacle and guide the at least one cutter about the obstaclewhilst moving in the cutting trajectory.
 8. The vegetation cutter ofclaim 6, wherein the at least one cutter further comprises a wire whichis longer than the at least one cutting blade such that any residualvegetation circumferent the docked obstacle is trimmed.
 9. Thevegetation cutter of claim 1, wherein the dock is substantiallycentrally located on the frame.
 10. The vegetation cutter of claim 1,wherein the dock is at the end of a channel in the frame.
 11. Thevegetation cutter of claim 10, wherein the channel tapers towards thedock.
 12. The vegetation cutter of claim 1, wherein the dock is adaptedto securely receive the obstacle.
 13. The vegetation cutter of claim 1,wherein the driver comprises a roller adapted to abut the member,whereby rolling of the roller moves the at least one cutter in thecutting trajectory.
 14. The vegetation cutter of claim 1, wherein thedriver is actuated upon receipt of the obstacle in the dock.
 15. Thevegetation cutter of claim 1, wherein the member is rotatable relativeto the frame, whereby rotation of the member causes the at least onecutter to move in the cutting trajectory.
 16. The vegetation cutter ofclaim 1, wherein the member is substantially planar and circular incross section.
 17. The vegetation cutter of claim 1, wherein theperiphery of the member comprises a plurality of frame engagements forengaging the frame.
 18. The vegetation cutter of claim 1, furthercomprising a vehicle engagement for coupling the vegetation cutter to avehicle.
 19. A method for cutting vegetation circumferent an obstacle,comprising: maneuvering a vegetation cutter of claim 1 such that theobstacle is received in the dock; actuating the driver, whereby the atleast one cutter moves in the cutting trajectory and vegetationcircumferent the docked obstacle is cut; and maneuvering the vegetationcutter such that the obstacle is no longer in the dock.